Traveling to Mexico

So in October we have wedding in Mexico and my kids will be 3.5 and 2.So with my oldest we already traveled abroad so know what to expect in plane with him but youngest never flew with plane but I will be prepared.

*But still any advice with traveling with two kids are welcome

And my second question is did I forgot something for beach: some sand toys,sunscreen,swimsuits,hats,life west (which one is good for toddlers?).

Or any advice or if I forgot anything else please share your expiriance.

(I have enough outfits so I’m not worried about that).